Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68a6188aadf1ce9…

MALICIOUS

PDF

81.0 KB Created: 2021-03-21 00:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c324741ef438c6e78bd91a5337901ddb SHA-1: 20a5a0c50f7ba700552e237178aeaa194222f306 SHA-256: a68a6188aadf1ce9356c9b93326bbe73af2fb2b2603b8a7eccb08ed97ea2122b
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLICKFIX' heuristic suggests social engineering to trick users into running commands, likely to download and execute a second-stage payload. The document body, though heavily obfuscated, contains references to 'word to pdf converter' and 'nitro professional', aligning with a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/award?keyword=word+to+pdf+converter+nitro+professional PDF link annotation
    • http://tuwatolu.22web.org/mac_os_x_operating_system.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/zolopuvuretoruzukojo.pdfIn PDF document text
    • https://jumaxejew.weebly.com/uploads/1/3/1/6/131606465/jubabadigu.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/fYhhjiK/south_african_soccer_skills_videos_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/FheVBii/94668157390.pdfIn PDF document text
    • https://cdn.sqhk.co/gipiwelabaka/ggdibhi/nice_guidelines_fetal_monitoring_during_labour.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/eMJjYgg/48545784598.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/d196eecd284.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/97638707153.pdfIn PDF document text
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/6c7316.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/ccdc1d5a3c.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/bisoxiwoliku_jileb.pdfIn PDF document text
    • http://ramedefinu.getenjoyment.net/cantilene_clarinet.pdfIn PDF document text
    • https://cdn.sqhk.co/gobavata/jf3girK/fubefixijofalojusovar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_e55665e0f267467389c98288c6390aad.pdf?index=trueIn PDF document text
    • http://bitugoxopezuwu.rf.gd/87230831250.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_6c67135bb3a048fab32d46f61135ae5d.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_3ba2cf30aa3949cf96686f0437d8d574.pdf?index=trueIn PDF document text
    • http://widevuwototavu.rf.gd/24582388586.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_e983207a73b146b19dd25c34cbb55f4e.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_a5b24b15f5f24e1f826d1d9b2c5d6740.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_be688f9f511a41ba99aba77d93dc2ad2.pdf?index=trueIn PDF document text
    • http://sujetolus.epizy.com/wamekejisofejabakukox.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_bcc4ad9f12624fe5950f2f846ae4d4b1.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_6aa555bd01b440c995b5a139d30188c9.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_c16c3feae273425092f2be9f1bc45b73.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 5008 bytes
SHA-256: f902b36a28a3e1da28c400060afd85f792ffe735701cac0169b83998bf82af56
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 10600 bytes
SHA-256: d23cc86dee422b0c8af46103b0004196486677319827867e0e07ed9049a90f10
font_02_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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